add custom migration

app/grants/migrations/0121_auto_20210722_0649.py

@@ -0,0 +1,24 @@
+# Generated by Django 2.2.24 on 2021-07-22 06:49
+
+import django.contrib.postgres.indexes
+import django.contrib.postgres.search
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('grants', '0120_auto_20210622_1021'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='grant',
+            name='vector_column',
+            field=django.contrib.postgres.search.SearchVectorField(null=True),
+        ),
+        migrations.AddIndex(
+            model_name='grant',
+            index=django.contrib.postgres.indexes.GinIndex(fields=['vector_column'], name='grants_gran_vector__534e95_gin'),
+        ),
+    ]

app/grants/migrations/0122_create_trigger.py

@@ -0,0 +1,31 @@
+# Generated by Django 2.2.24 on 2021-07-22 06:51
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('grants', '0121_auto_20210722_0649'),
+    ]
+
+    operations = [
+        migrations.RunSQL(
+            sql='''
+              CREATE TRIGGER vector_column_trigger
+              BEFORE INSERT OR UPDATE OF title, description, vector_column
+              ON grants_grant
+              FOR EACH ROW EXECUTE PROCEDURE
+              tsvector_update_trigger(
+                vector_column, 'pg_catalog.english', title, description
+              );
+
+              UPDATE grants_grant SET vector_column = NULL;
+            ''',
+
+            reverse_sql = '''
+              DROP TRIGGER IF EXISTS vector_column_trigger
+              ON grants_grant;
+            '''
+        ),
+    ]